Federal health officials said Tuesday that 87 people have become ill in eight states: Arizona, California Colorado, Hawaii, Nevada, New Mexico, Utah and Washington. No cases have been identified in Oregon.

More than half of those who developed an infection have been hospitalized, according to the national Centers for Disease Control and Prevention. No one has died.

The outbreak was traced to a frozen berry and pomegranate blend processed by Townsend Farms in Fairview. The mix contained berries from Chile and Argentina and cherries from Washington state. But it was the pomegranate seeds from Turkey that caused the outbreak, according to the Centers for Disease Control.

Costco sold nearly 333,000 packages of Townsend Farms Organic Antioxidant Blend nationwide. The mix was also sold at Harris Teeter stores on the East Coast under that company's label, but no one who bought the Harris Teeter product has reported being ill.

Hepatitis A has a long incubation period -- up to 50 days -- so more people could get sick. Costco has offered free vaccine to anyone who bought the product at one of

its stores. The vaccine has been proven effective in prevention infection if it's administered within 14 days of exposure to the virus. An immune globulin shot can prevent hepatitis A as well if given within the same time period.

Symptoms of hepatitis A include vomiting, nausea, fatigue and jaundice.

Townsend Farms has recalled the berry and pomegranate blend. The company advised consumers to take the receipt to the store for a full refund.